Die holder



Aug. 5. 1924' J. H. MATTHEWS DIE HOLDER Filed Feb. 7 1924 F'IG.I-

Patented Aug. 5, 1924..

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JAMES H. MATTHEWS, F PITTSBURGH, PENNSYLVANIA.

DIE HOLDER.

Application filed'jebruary T 0 all 20 ham it may 001m 1%: 7

Be it known that I, J AME-S H. MATTHEWs, residing at Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, a

citizen of the United States, have invented o-r discovered certain newand useful Improvements in Die Holders, of which improvements thefollowing is a specification My invention relates to improvements in 10dieholders', particularly in die holders such as are shown in LettersPatent of the United States No. 1,214,662, granted February 6, 1917 onthe application of Joseph Escher and John Nagy, to James H. Matthews &

Company, as assignee.

A die holder embodying my present invention is illustrated in theaccompanying drawings. Fig. I is a view in side elevation of the dieholder equipped with a set of dies; Fig. II is a view in medial andlongitudinal section, on the plane indicated by the line IIII, Fig. I;Fig. III is a View in end elevation; and Fig. IV is a view incross-section, on the plane indicated at IV-IV, Fig. I.

The body 1 of the die holder is provided terminally with a seat 2 inwhich an assembly of dies cl may be placed. The seated dies are held inposition by a lock 3, which, as clearly shown in Fig. II, passingthrough an opening in the holder enters notches formed in the bodies ofthe dies themselves to receive it. My invention concerns particularlythe locking member 3.

As hitherto constructed, and as shown and described in the Escher andNagy patent alluded to above, this locking member is essentially a metalstrap anchored at one end in the body of the holder, and turned at theother end to form a right-angled tooth, to enter the notch in the die. Aspring-backed bolt is employed to hold the metal strap in place with itstoothed end in die-engaging position, and when shifted by manualpressure to flex the strap and allow the insertion and removal of diesto and from the holder. This locking member has been found to be theweak element in the holder. It soon breaks, and this breakage is amatter of considerable annoyance to the user, and therefore to themanufacturer as well.

After study and experimentation I have discovered how by modification inits form and mode of operation I can improve this locking-member andcause it to endure long and satisfactory service, I make it no 7, 1924.Serial No. 91,091.

longer as a strap anchored at one end, but as a plate mounted to movewithout flexure and I modify it in shape, so that it is not bentabruptly at a right angle to afford a terminal die-engaging tooth.

As shown in the drawings the locking member 3 is formed of a strap orplate of steel secured to and borne by, and borne solely by the bolt 5.The bolt 5 extends through and beyond a transverse opening formed in thebody of the holder, and within this opening it is encircled by andengaged by a spring 6 of sufiicient power to hold it normally (as seenin Fig. II) at the right-hand end of its range of movement and to holdthe locking member which it carries, in die-engaging position.

The die-engaging end 1 of the locking member 8 is not a mere toothturned aside at the tip of the long locking member, it is the terminusof a long crook 7 formed by bending into a compound curve the end of thestrap of which the locking member is formed. The particular shape whichI have found eflicacious and satisfactory is fully illustrated in Fig.II.

In three respects particularly I have improved upon the locking memberof the prior art, and produced a more serviceable article. First, I haveeliminated from the locking member itself flexure in operation. Second,I have separated the locking member from immediate anchorage upon thebody of the die holder; it is carried mediately, by bolts 5 and spring6. Third, I have introduced the long crooked neck leading to thedie-engaging tip 4.

The prior-art structure, I have discovered, breaks in consequence of acrystallization of its constituent metal. And by the changes in shapeand mounting and in mode of operation, which now I have described andindicated, I have so far eradicated the tendency to crystallization,that I have a die holder which in all its parts is durable, beyond whathitherto has been produced, and satisfactory in that respect, where theprior-art structure is annoying and unsatisfactory.

I claim as my invention:

1. A holder for a removable die consisting of a body member providedwith a dieseat, a spring-backed bolt extending transversely through andmovable within an opening in said body member, and a locking m mberborne by said bolt alone and movable with said bolt to and from dieofcompound curvature terminating in a 10 engaging position. 7 die-engagingtip.

2. A holder for a removable die consist- In testimony whereof I havehereunto set ing of a body member providedwith a diemy hand. 5 seat, aspring-backed bolt extending transversely through and movable within anopen- JAMES MATTHEWS ing in said body member, and a locking mem-Witnesses: her in the form of a strap engaged by said H. WQLAUDERMILCH.

bolt and at its free end shaped to a crook C. M. WATKINS.

